#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <vector>
using namespace std;
class Solution {
public:
    const int MIN = 0x3f3f3f3f;
    int maxProfit(vector<int>& prices) {
        int n = prices.size();
        vector<vector<int>> f(n, vector<int>(3, -MIN));
        auto g = f;
        f[0][0] = -prices[0];
        g[0][0] = 0;
        for (int i = 1; i < n; ++i)
        {
            for (int j = 0; j < 3; ++j)
            {
                f[i][j] = max(f[i - 1][j], g[i - 1][j] - prices[i]);
                g[i][j] = g[i - 1][j];
                if (j - 1 >= 0)
                {
                    g[i][j] = max(g[i - 1][j], f[i - 1][j - 1] + prices[i]);
                }
            }
        }

        int ret = 0;
        for (auto e : g[n - 1])
        {
            ret = max(ret, e);
        }
        return ret;
    }
};
int main()
{
	return 0;
}